adding trigger thresholds for AK4

Used brilcalc to calculate the ak4 trigger thresholds. Command used: brilcalc lumi --normtag /cvmfs/cms-bril.cern.ch/cms-lumi-pog/Normtags/normtag_PHYSICS.json -u /pb -i /afs/desy.de/user/a/asingla/public/2018UL.json --hltpath HLT_PFJet40_v* Here the 2018UL.json is the sum of all eras' (A to D) processedLumis.json files. The processedLumis.json was obtained by running crab report on the crab output directory for each era.

mentioned in commit 0a1b427e

merged